Counterweight for toilet tank



FIG. 1 is a perspective view taken from the top, front and left side of a counterweight for a toilet tank showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof and

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a front elevational view thereof; and

FIG. 7 is a rear elevational view thereof. 

The ornamental design for a counterweight for toilet tank, as shown and described. 